Murphy, J. (1991). Farmers' estimations as a source of production data: Methodological guidelines for cereals in Africa. World Bank.
Chicago-referens (17:e uppl.)Murphy, Josette. Farmers' Estimations as a Source of Production Data: Methodological Guidelines for Cereals in Africa. Washington: World Bank, 1991.
MLA-referens (9:e uppl.)Murphy, Josette. Farmers' Estimations as a Source of Production Data: Methodological Guidelines for Cereals in Africa. World Bank, 1991.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.